Invited Session: Energy Recovery
Small Utilities Can Afford Sustainability with Dry AD and Biofuel Production
Monday, September 25, 2017
16:15 – 16:45
The Hernando County Public Works Department, Solid Waste & Recycling Division, is responsible for providing disposal of solid wastes generated within the county, including organic materials such as biosolids, yard (green) waste and food waste. Currently, wastewater sludge and food waste are placed in the Class I landfill and green waste is shredded to produce mulch that is provided to Hernando County residents at no charge. Based on the recent Waste Composition Study performed by Brown and Caldwell (BC) at the Northwest Waste Management Facility (NWWMF) in April 2016, organic waste delivered to the NWWMF comprised 24.5 percent of the total waste stream. This presentation discusses the results of the economic feasibility of dry anaerobic digestion followed by biodiesel production for small distressed communities as a means of generating energy from organic waste materials received by the county for disposal. Composting is also investigated as a means of managing digestate (residual solids) from the digestion process to produce a Class AA biosolids product for use as a fertilizer or soil amendment.
Following this presentation, participants will be able to understand that with new efficient technologies small utilities can increase their recycling rates dramatically and breakeven on the capital costs in less than four years.